Define __mig_strlen to support dynamically sized strings in hurd RPCs

We make lib{mach,hurd}user.so only call __mig_strlen which can be
relocated before libc.so is relocated, similar to what is done with
__mig_memcpy.
Message-Id: <ZE8DTRDpY2hpPZlJ@jupiter.tail36e24.ts.net>

1 files changed, 26 insertions, 0 deletions

diff --git a/mach/mig_strlen.c b/mach/mig_strlen.c
new file mode 100644
index 0000000000..3c5ef8db15
--- /dev/null
+++ b/mach/mig_strlen.c
@@ -0,0 +1,26 @@
+/* strlen stub for mig stubs in libmachuser and libhurduser.
+   Copyright (C) 2023 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <mach.h>
+#include <string.h>
+
+vm_size_t
+__mig_strlen (const char *src)
+{
+  return strlen (src);
+}